Environmental embrittlement of two-phase Fe30Ni20Mn35Al15

► The ductility of Fe30Ni20Mn35Al15 is strain-rate sensitive in air at low rate. ► The ductility is independent of strain rate for strain rates ≥3 × 10−3 s−1 ► The elongation and UTS in oxygen were insensitive to strain rate. ► The reduction of ductility in air is attributed to hydrogen embrittlement.